Bevel-wheel shaper



April 8, 1924.

- c; BARTH BEVEL WHEEL sHAPER 6 Sheets-Sheet l Filed July 10 V1920 6Sheets-Sheet 2 Filed July 10 1920 pril 8 1924.

April s, 1924.

C. BARTH BEVEL WHEEL SHAPER 1o e sheets-sheet 's Aprils, 1924.l

cz.v BARTH BEVEL WHEEL sHAPsn Filed' July' 1o In ff 7))62 jm a@ `(-3Sheets-Sheet 4.

April 8 1924.

c. BARTH BEVEL WHEEL SHAPER Filed- July 10 1920 6 Sheets-Sheet 5 LEA /5EMM,

April 8 1924.

e sheets-sheet 6l C BARTH BEVEL WHEEL SHAPER Filed July 10 MHZ f2Patented pr. 8, 1924.

UNITED STATES CURT BARTH, OF HAMBURG, GERMANY.

BEVEL-WI-IEEL SHAPER.

Application filed July` 10, 1920. Serial No. 395,417.

(GRANTED UNDER THE PROVISIONS F THE ACT 0F MARCH 3, 1921, 4l STAT. L.,1313.)

To all whom t may concern:

Be it known that I, Dr. CURT BARTH, a citizen of the German State,residing at Hamburg, Germany, Klostertor 8, have invented certain newand useful Improvements in or Relating to Bevel-Wheel Shapers (for whichI have filed applications in Germany, B 87,501 I/49b, filed'Sept. 27,1918, Patent No. 344,991, and Germany,

88,668, filed March 5, 1919), of which the following is a specification.

This invention relates to machines for shaping bevel gear wheels of thetype operating on the generating principle, in which both the cuttingtool and the wheel blank are rotated. In machines of this type, the

mutual rotation of the tool and work is` produced by either the motionof the tool being initiated by the main drive and the motion of the workheilig then derived from the motion of the tool, or vice versa. Now,

for the purpose of deriving the second motionl from the first, there hasbeen devised heretofore special gearing mechanisms constituting a.yparticular feature of the respective commercial machine, as forexample, the band of ythe Bilgram bevel gear Shaper and the oscillatingstrap of the Gleason bevel gear Shaper.

It has previously been proposed to derive both the motion of the .tooland' also that of the work directly from the main drive shaft ormechanism, a kdhange-speed gear being employed for the change of thegear ratios. But, such change-speed gears have,

however, been located at such a point in the driving train that therotation of the wheel blank and of the tool couldY not be 'affectedindependently by the one from the 40 other, so that in ysuch machinesthe opera` tion of effecting the proper ratio between the rotations ofthe respective parts is a very dilicult and complicated one.

The movement ofthe blank and the movement of the tool must be modifiedfrom different points of view; the former movement depends on the numberof teeth and the latter on the shape of a tooth section. Consequently itwill generallyebe necessary to modify both movements during adjustmentfor a given blank, since bo-th t-he number of teeth and their shapechange.

Now, according to the present invention two separate and distinctchange-speed gears are provided, one arranged between the main drive andthe tool 4and the other betweenthe main drive and the wheel blank, sothat the speed of rotation ofthe tool may be varied independently of thespeed of the blank or vice versa. The provision of this doublechangespeed gear renders it posnow made use of, in accordance with thepresent invention, in connection with bevel wheel shapers of the type inwhich both the cutting tool and the wheel blank are rotated.. A furtherfeature of t-he invention consists, therefore, in adapting the tools tobeset transversely to the direction in which they are toI work for thepurpose of producing skew bevel gear wheels. p

Two embodiments of my invention are shown, by way of example, in theaccompanying drawings, in which- Figure 1 shows a cross section throught-he machine, taken on line 1-1 of Fig. 2,

Eig. 1a is a similar cross section, the lower half being a side view ofthe machine,

Fig. 2 is a section taken on Ithe line 2 2 of Fig. 1,

Fig. 3 is a` plan view partly in section of the. machine shown in Fig.1,

Fig. 4 illustrates a modified form of construction and is a longitudinalsection of a machine,

Fig. 5 is a view looking to the left in the direction of the tool restof the parts shown in Fig. 4, the lower tool post being omitted, and

- Fig. 6 is a top view of the parts shown in Fig. 5.. i

The kdriving shaft 2 together with the driving pulley4 3 are mounted inthe frame 1 of the machine. Rigidly mounted on said shaft 2 is a gearwheel 4. LAn additional shaft 5 is co-axially disposed with shaft 2,this shaft 5 being mounted at one end in the frame, and at the other endin the shaft l other gear -10 is mounted.

' two shiftable clutch members 6 and 7 slidable on, but notrotatable-with respect to, the said sleeve 8. .lilhen the clutch 6 isbrought into engagement with 'a corre-r sponding clutch portion a"operatively connected with the gear wheel 4, shaft 2 and sleeve 8 willbe directly coupled for high speed, and by closing the coupling 7 therewill be effected a connection between the sleeve 8 and a clutch member 9fixed to the shaft 5. This latter drives, by means of shaft 5, a gear 10meshing with a gear 10L on an intermediate shaft 10b on which an- Thisgear 10 meshes with a gear 100 ou a second intermediate shaft 5a. Bothintermediate shafts are journaled in the fra-me 1 parallel to the shafts2 and 5. On the shaft 5 there is fixed a second gear la meshing with thegear wheel a for the purpose of driving the shaft 5 by means of theVmain shaft 2, when members 7 and 9 are coupled.

`The clutch members G and 7 are engaged, in known manner, by clutch armsnot shown on the drawings and adapted to be commonly operated.

A gear wheel 11, which is keyed on the sleeve 8, meshes with gear wheel12 mounted on a sleeve 98 rotatably arranged on shaft 13.

The sleeve 98 has a clutch member 117 axially rmovably, but notrotatably mounted thereon, said clutch being adapted to engage the hub111 of a gear controlling an automatic shifting device not shown but ofknown construction.

The shaft 13 has a spur Wheel 14C fixed to one of its ends by means ofwhich, with therinterposition of change speed wheels 15 the worm 1G isdriven. The said worm gears with a wheel 17 which is rigi ily connectedto the face plate 18. This latter carriesV the adjustable planing tools,of

known construction, disposed in tool posts 19. These posts possess areciprocatory motion, and are driven by a rack gear 13 and a crank 20,the motion of which latter may be derived from the mam drive,'asinstance a toothed wheel 80, bevel gear 81, f 82 crank 83 and connectinglink 84. (Fig.

3). rlhe work is attached to a face plate or a chuck 21 mounted on ashaft 22. This latter obtains its rotation by the intervention of a wormgear 23 and bevel gears 2a from a shaft 25. The latter is connected bymeans of three spur wheels 26, 26a, 26b to a spindle 27 on which thereis mounted a bevel wheel`28 which is adapted to engage a longitudinalbevel wheel 29 meshing with a bevel wheel 30 co-axially arranged andfixed on the same axle 30a with a toothed wheel 31. rlhis wheel isconnected by means if he chuck is mounted on a bearing 33 which isadapted to be rotated around the centre of the machine traversing theaxis of the bevel wheel 29. Each. time the machine is set the bearingmust be rotated Vso that the pitch cone of the tooth to be cut contactswith the pitch plane of therface plate 18.

'lf he operation of the machine, the parts being` in the position inwhich the clutch members 7 and 9 and the clutch members 117 and 111 arein engagement with each other, respectively, is as follows:

Ey means of driving pulley 3 and by intewention of the gears 4 and f1,shaft 5a, gears 1 O and 10', shaft 10b, gears 10a and 10, shaft 5, gears11 and 12, shaft 13, gears 14 and 15, worm 1G and worm wheel 17, theface plate 18 carrying the planing tools and by intervention of thegears 4c and 4a, shaft 5, gears 100 andlO, shaft 10", gears 10a and 10,shaft 5, gears 11 and SI1, shaft 93, change speed gears 32, gear 31,bevel gears 30, 29 and 28, spindle 27, spur wheels 26, 26EL and 26",shaft 25, bevel gears 24, worm gear 23 and shaft 22, the chuck 21carrying the work piece are caused to `be rotatedV simultaneously. Bythe interposition of suitable change wheels 32 and 15,

respectively, this rotation will be in conrocating motion carried out bythe tool posts 19 supporting the planing tools. The machining operationis continued until the tooth about to be cnt has completely generatedfrom the tooth formed by the planing tools. As soon as the shapingoperation has been completed the automatic shifting de vice mentionedabove moves the clutch members 6 and 7 2) to the right hand side, herebyconstituting a direct connection of shaft 2 and 5 by means of the clutch6 and reversingthe machine for the quick return.

In a similar manne-r, when the quick'return.

comes to an end the automatic shifting device causes the movement ofclutch members 6 and 7 to the `left hand'side. ln this way couplings 7and 9 are again engaged and couplings d and 6 are disengaged. In thisway the automatic working of the ma- Y chine i" `oerformed.

Y wheel 12.

While the rotating movement of the tools -has been interrupted, theshitting or feeding is performed, the speed change wheels 32 being soadjusted, that one revolution of wheel 12 corresponds t-o the movementof the work piece for one tooth space.

In the embodiment shown in Figs.' 4 to 6, and relating to theapplication of the subject matter of this invention to a process ofmanufacturing screw bevel wheels, the numeral 21, described with respectto Figs. 1 to 3, denotes the chuck in which the work to be machined isfixed. Opposite this chuck is disposed the face plate, which, however,consists of two parts. On the worm wheel 17, driven by the worm 16 thereis rigidly mounted a guide plate 38 provided with a dovetailed guide,along which the portion 34 of the face plate supporting the tool posts19 for the planing tools is adapted to be adjusted. The conjointdisplacement of the plate portion 34 with the tool posts 19 is effectedby means of a screw 35 mounted to rotate in the part 33 and providedwitha nut fixed to the part 34. Set screws 3G, adapted to bear against aspacing wedge 3T, serve to secure the said parts in their position.

By means of the described device it is possible to displace the two toolposts 19 supporting the shaping tools relatively to the face plate sothat, during the mutual generating action effected by the face plate andthe work, the tools will be prevented from describinga path in thedirection toward the center of the wheel, but will describe a pathtangential toan imaginary circle drawn from the center of the saidwheel, thus producing screw bevel wheels.

In order to secure the eccentric adjustment of part 34 with the shapingtools, the drive is effected from the toothed wheel 38, driven by themain shaft, across a toothed wheel 39 and the shaft 40 to a toothedwheel 41 which latter meshes with tfhe tooth Wheels 43. In order toenable the toothed wheel 41 to engage with the toothed wheel 43, evenwhen part 34 which carries the tool posts 19 is shifted, the shaft 40which connects the toothed wheel 41 with the toothed wheel 39 ismovable. The said shaft is provided with two universal joints 44, and isdivided, one part engaging with the other by means of a pin 45, whichenables a longitudinal movement of the two parts of the shaft but not areciprocal movement.

The drive hereinbefore described enibodies the special advantage overand above that disclosed in connection with Figs. 1 to 3, in that theoscillating movement required for the reciprocating motion of thecutting tools is only effected directly on their supporting post whileup to that point there prevails merely a rotary motion, so that themachine will be able to work free from all shocks.

I claim as my invention:

1. In a machine for shaping bevel wheels of the type described, thecombination of a rotating chuck for t-he work piece; a rotating faceplate; reciprocating tools supported by said face plate; a main drivefrom which the rotation of said chuck and face plate is derived; and twoseparate change-speed gear trains, the one of which being arrangedbetween the main drive and the rotating chuck and the other beingarranged between the main drive and the rotating face plate.

2. In a machine for sha-ping bevel wheels of the type described, incombination a rotating chuck for the work piece; a rotating face-plate;reciprocating tools, supported by said face plate; a main drive fromwhich the rotation of the chuck and face plate is derived; and twoseparate change-speed gear trains, the one of which being arrangedbetween the main drive and the rotating chuck and the other between themain drive and the rotating face plate, the two gear trains beingadjustable independently the one from the other.

3. In a machine for shaping bevel wheels of the type described, incombination a rotating chuck for the work piece; reciprocating cuttingtools; a face plate: supporting said tools; a main drive; two separategear trains connecting said main drive with the chuck and face platerespectively; and means for adjusting said cutting tools transversely tothe direction in which they are to work for the purpose specified.

4. In a. machine for shaping bevel wheels of the type described, incombination a rotating chuck for the work piece; reciprocating cuttingtools; a face plate supporting said tools; a main drive; and twoseparate gear trains connecting said main drive with the chuck and faceplate respectively; said face plate being divided into two parts the oneof said parts which is adapted to carry the tools being adjustable withrespect to the other part which is connected to the Vdrive to permit theadjustment of said tools transversely to the direction in which they areto work.

5. In a machine for shaping bevel wheels of the type described, incombination a rotating chuck for the work piece; reciprocating toolposts; a face plate supporting said tool posts; a main drive; and twoseparate gear trains connecting said main drive with the chuck and theface plate respectively, the gearing connecting the main drive with theface plate consisting of a reciprocating part immediately connected tothe said tool posts and a revolving part connecting the saidreciprocating part to the main drive.

6. In a machine for shaping bevel wheels of the type described, incombination a rotating chuck for the Work piece; reciprocating toolposts; a face plate supporting said tool posts and being divided intotWo parts the one carrying the tool parts being adgustable with respectto the other; a main drive;

a gear train connecting said niain drive with the chuck; a second geartrain connecting the inain drive With the face plate, and coinprisiug areciprocating part immediately connected to the said tool posts and arevolving part connecting the Said reciprocat-v ing part to the maindrive and means Whereby rotary movement may be transmitted to thecutting tools at any adjusted position of said face plate parts.

'7. In machine for shaping bevel Wheels of tlie type described, thecombination of a rotating chuck for the Work piece; a. rotating toolcarrying element; a c oninion drive for said chuck and element; andmeans whereby the chuck may be angularly adjusted with relation to thetool carrying element.

In testimony whereof l have affixed my signature.

DR, oUR'r BARTH.

